Phosphorescent Sheet with Overlapping Reflection Layer
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Solution Overview
Problem
Phosphorescent materials emit light that is less bright compared to light emitters that consume energy, necessitating a method to make the emitted light from phosphorescent materials more visible.
Innovation Solution
A sheet member is produced by forming a phosphorescent layer on a transmissive substrate and a reflection layer that overlaps the phosphorescent layer in the thickness direction, using reflective materials like pearl pigments, aluminum paste, metal deposited films, or white paper to reflect and enhance the visibility of the emitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a phosphorescent material is used to emit light, then the light emission function is achieved, but the brightness is insufficient compared to energy-consuming light emitters
Solution Approach 1:
A reflection layer is introduced as an intermediary between the phosphorescent layer and the observer. This reflection layer reflects the light emitted by the phosphorescent material back toward the observer, effectively increasing the perceived brightness without requiring additional energy input. The reflection layer acts as a mediator that enhances the visibility of the already-emitted light.
Solution Approach 2:
The invention utilizes optical properties (reflection, transmission, absorption) of different layers to enhance the visibility and perceived brightness of the phosphorescent light. By carefully selecting materials with specific optical characteristics for each layer, the system optimizes light interaction to maximize brightness perception without energy consumption increase.
2Adaptability or versatility
If the reflection layer is formed by printing, then high degree of freedom in patterning is achieved, but manufacturing precision may be compromised
Solution Approach 1:
The invention changes the manufacturing parameters and methods for forming different layers. The phosphorescent layer and reflection layer are formed using different printing techniques or sequential printing processes, allowing each layer to be optimized for its specific requirements. This parameter adjustment enables both high patterning flexibility and acceptable manufacturing precision.
Solution Approach 2:
The sheet member is divided into distinct functional layers (substrate, phosphorescent layer, reflection layer) that can be manufactured and positioned independently. This segmentation allows each layer to be optimized separately, with the reflection layer being printed with high flexibility while maintaining sufficient alignment through the layered structure design.
3Illumination intensity
If the reflection layer overlaps the phosphorescent layer in the thickness direction, then light reflection efficiency is improved, but the structural complexity increases
Solution Approach 1:
Instead of increasing horizontal complexity to achieve light reflection, the invention utilizes the thickness dimension (z-direction) by stacking layers. The reflection layer is positioned in the thickness direction to overlap and reflect light from the phosphorescent layer, converting a potential 2D complexity problem into a simpler 3D layered solution.
Solution Approach 2:
The sheet member is constructed as a composite structure with multiple functional layers, each made from materials optimized for its specific function. The substrate provides mechanical support, the phosphorescent layer provides light emission, and the reflection layer provides light reflection. This composite approach achieves high light reflection efficiency while maintaining manageable structural complexity through clear functional separation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The reflection layer significantly increases the brightness of the phosphorescent light, allowing it to be more distinctly visible, while also providing flexibility in patterning and shape formation, and inhibiting deterioration of the sheet member's appearance.
Implementation Method 1
a reflection layer provided on a surface of at least either one of the substrate or the phosphorescent layer in such a manner that the reflection layer overlaps at least a part of the phosphorescent layer in a thickness direction of the substrate. The reflection layer comprises at least a reflective material to reflect light.
Implementation Method 2
a phosphorescent layer containing a phosphorescent material... light emitted from the phosphorescent layer
Data Source
AI summary
Provided is a production method of a sheet member, including a process of forming, by printing, a phosphorescent layer containing a phosphorescent material on a surface of a sheet-shaped substrate with a transmissive property, and a process of forming a reflection layer, by printing, including a reflective material to reflect light on a surface of at least either one of the substrate or the phosphorescent layer in such a manner that the reflection layer overlaps at least a part of the phosphorescent layer in a thickness direction of the substrate.